US1668886A - Compressed-air starting device for internal-combustion engines - Google Patents

Compressed-air starting device for internal-combustion engines Download PDF

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Publication number
US1668886A
US1668886A US712880A US71288024A US1668886A US 1668886 A US1668886 A US 1668886A US 712880 A US712880 A US 712880A US 71288024 A US71288024 A US 71288024A US 1668886 A US1668886 A US 1668886A
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United States
Prior art keywords
piston
valve
pressure
starting
compressed
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Expired - Lifetime
Application number
US712880A
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English (en)
Inventor
Becker Heinrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fried Krupp Germaniawerft AG
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Fried Krupp Germaniawerft AG
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Publication date
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations

Definitions

  • This invention relates to devices for starting internal combustion engines by means of compressed air, and 1t has more particularly reference to devices of this kind in which the n valve gear automatically Aenters into or out of action upon the compressed air being admitted and stopped.
  • the present invention has for its object to provide a device which prevents a premature opening of the .starting valve and yet insures a constant contact of the cam roller with the cam disc during the starting operation.
  • This object is attained by providing a lost motion connection between the controlling piston and the starting valve and by providing for the application of fluid pressure to the starting valve itself just sufficient to open it when the compression in the cylinder has dropped to the pressure of the starting air, while the pressure on the controlling piston keeps the cam end of the restraining lever in constant contact with the cam, this being permitted whether the starting valve opens or not, because of the above mentioned lost motion connection.
  • the subject matter of the invention is ilpressed starting air is led through thef'cylinder head to the valve by a conduit a. i
  • a controlling piston C is mounted for vertical reciprocation.
  • a small cylinder c is connected to the lower end of niston C by a short neck c2.
  • a piston d* which reciprocates in the cylinder c.
  • the space above piston Z4 is in communication with the space above the controlling piston C through a bore c3, and both spaces are con nected by means of a pipe M to a source ⁇ of compressed air of constant pressure such as the compressed starting air for example.
  • a spring E which is inserted between the valve cage B and the lower face of the cylinder c tends to hold the starting valve closed.
  • a valve lever H which s mounted for rocking motion on the shaft G has an arm 7L which is forked at its end to embrace the neck c2 of the piston C, While the other arm ⁇ of the lever H. carries a roller 71.2 which bears against a cam K, is.
  • the upper and lower surfaces of the forked end of lever arm L are spherical to Vprovide for the relative m0- tion of the piston C and the lever H.
  • the starting valve should open when the pressure in the working cylinder has sunk below 285 pounds per square inch.
  • the pressure of the starting air is assumed to be 355 pounds per square inch and the Atotal pressure on the starting valve from within the cylinder at 285 pounds per square inch is 2650 pounds, for example.
  • the diameter of the piston d* which is connected with the valve stem is of such a dimension that the greatest pressure of the compressed air transmitted to it is likewise about 2650 pounds.
  • the diameter of the controlling piston C is such that the pressure exerted by the same on the arm 7L of the valve lever through the iniiuence of the compressed air acting on the piston C is about 3300 pounds or more.
  • the pressure in the working cylinder ⁇ is less than Q85 pounds per square inch when the recess 7c moves opposite the roller 7a2, the pressure on the piston Z4 will be sufficient to overcome the pressure on the valve d and the valve will therefore move downward with the piston C and cylinder c.
  • the cam roller 71,2 is constantly held against the cam disc K by the action or the controlling piston C throughout the operation, and therefore the opening of the valve will ltake place without the valve .lever being subjected to any sudden movements or shocks.
  • a valve gear adapted to automatically enter into and out of action upon admitting and stopping the compressed air and a controlling piston included in said gear, apressure cylinder and a second piston inserted between the controlling piston and the stem of the starting valve, the diameter of said second piston being of a dimension such as to cause the pressure exerted on it to open the starting valve, independently on the movement oi' said valve gear, upon a determined pressure prevailing in the engine cylinder, and the diameter' oft the controlling piston being of a dimension such as to cause the pressure exerted on it by the compressed starting air to outweigh the pressure ol the said second piston.
  • a compressed air starting device for internal combustion engines, comprising a starting valve, a Valve gear adapted to automatically enter into and out of action upon admitting and stopping the compressed air and aV controlling pistonincluded in said gear, a pressure cylinder and a second piston inserted between the controlling piston and the stem of the starting valve, the diameter of said second piston being of a dimension such as to cause the pressure exerted on it to open the starting valve, independently on the movement of said valve gear, upon a determined pressure prevailing in the engine cylinder, and the diameter' of the controlling piston being of a dimension such as to cause the pressure exerted on it by the coinpressed startiim ⁇ air to outweigh the pressure of the said-second piston, said controlling piston forming at the same time the pressure cylinder for said second piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Reciprocating Pumps (AREA)
US712880A 1923-06-02 1924-05-12 Compressed-air starting device for internal-combustion engines Expired - Lifetime US1668886A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE582044X 1923-06-02

Publications (1)

Publication Number Publication Date
US1668886A true US1668886A (en) 1928-05-08

Family

ID=6571198

Family Applications (1)

Application Number Title Priority Date Filing Date
US712880A Expired - Lifetime US1668886A (en) 1923-06-02 1924-05-12 Compressed-air starting device for internal-combustion engines

Country Status (4)

Country Link
US (1) US1668886A (de)
AT (1) AT100109B (de)
FR (1) FR582044A (de)
GB (1) GB216895A (de)

Also Published As

Publication number Publication date
FR582044A (fr) 1924-12-10
GB216895A (en) 1925-04-09
AT100109B (de) 1925-06-10

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